.container {
	width: 500px;
	height: 500px;
	margin: 100px auto;
	border: 5px solid #000;
}
.input-field {
	font-family: '宋体', serif;
	width: 100px;
	height: 100px;
	position: absolute;
	top: 10px;
	left: 10px;
	border: 5px solid #000;
	text-align: center;
	font-size: 90px;
	padding: 5px;
}